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Proceedings Paper

Van der Lugt optical correlation for use in the improvement of hermetically sealed microstimulator technology
Author(s): Colleen Mary Fitzpatrick; Edward P. Mueller
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Paper Abstract

As neuroprostheses become smaller, the need for superior quality control becomes vital. For such devices, Van der Lugt optical correlation (VLOC) techniques, involving Fourier transform holography, offer the potential of superseding conventional leak testing methodologies -- in that working with light is cleaner, faster, more sensitive, and eliminates the disadvantages of tracer gas introduced through backfilling or `bombing.' Current leak testing methods often prove inadequate for very small and delicate devices, as they sometimes involve inordinate stress on the package, or introduce undesirable results due to chemical considerations. In the case of very small packages, gross leaks are often missed by conventional means, since minute quantities of tracer gas introduced into the package may have disappeared by the time the test is run. VLOC techniques have been shown to overcome many of these limitations. The preliminary studies reported here indicate that VLOC techniques are capable of detecting leaks in the range of 10-6 and above in large aluminum-enclosed electronic packages. Furthermore, the method has been proven capable of automation through the use of a thermoplastic recording camera.

Paper Details

Date Published: 1 August 1992
PDF: 11 pages
Proc. SPIE 1647, Holography, Interferometry, and Optical Pattern Recognition in Biomedicine II, (1 August 1992); doi: 10.1117/12.60212
Show Author Affiliations
Colleen Mary Fitzpatrick, Electro-Optic Consulting Services (United States)
Edward P. Mueller, Ctr. for Devices and Radiological Health (United States)


Published in SPIE Proceedings Vol. 1647:
Holography, Interferometry, and Optical Pattern Recognition in Biomedicine II
Halina Podbielska, Editor(s)

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